Marinette relinquishes her role as both the Guardian of the Miracle Box and as the holder of the Ladybug Miraculous, resulting her friendships to be greatly strained. Meanwhile, the Brotherhood have a plan to take down the French Miraculous Superhero Team, in the form of a shapeshifting sentimonster, while Darius (AKA Xiao Chang) plans to corrupt Paris' everyday Ladybug.
20 parts